Structural and chemical investigation of interface related magnetoelectric effect in Ni/BiFe0.95Mn0.05O3 heterostructures

B. Negulescu (1) , J. Wolfman (1) , Christophe Daumont (1) , Nazir Jaber (1) , Pascal Andreazza (2) , Thibaud Denneulin , Sylvie Schamm-Chardon (3)

1 GREMAN - UMR 7347 - GREMAN (matériaux, microélectronique, acoustique et nanotechnologies)
2 ICMN - Interfaces, Confinement, Matériaux et Nanostructures
3 CEMES-MEM - Matériaux et dispositifs pour l'Electronique et le Magnétisme

The magnetoelectric coupling mechanism in Ni/BiFe0.95Mn0.05O3 heterostructures is investigated through a detailed microstructural study of the BiFe0.95Mn0.05O3 film and a chemical analysis of the Ni/BiFe0.95Mn0.05O3 interface. The four structural variants expected in BiFe0.95Mn0.05O3 are detected by high resolution X-ray diffraction reciprocal space mapping method. The ferroelectric domain structure is imaged with transmission electron microscopy. Oxidized Ni is evidenced at the Ni/BiFe0.95Mn0.05O3 interface by electron energy loss spectroscopy and X-ray photoemission spectroscopy, although the degree of Ni oxidation is independent of the magnetoelectric state of the heterostructure.

Mots clés: BiFeO3 thin film; Magnetoelectric coupling; Multiferroic; Ferroelectric structure; Ionic migration; Exchange coupling

Domaines: Science des matériaux [cond-mat.mtrl-sci]

B. Negulescu, J. Wolfman, Christophe Daumont, Nazir Jaber, Pascal Andreazza, et al.. Structural and chemical investigation of interface related magnetoelectric effect in Ni/BiFe0.95Mn0.05O3 heterostructures. Applied Surface Science, 2019, 481, pp.234-240. ⟨10.1016/j.apsusc.2019.02.232⟩. ⟨hal-02070799⟩